Officials are probing how a 51-year-old highway bridge came to collapse in the Italian port city of Genoa yesterday, killing at least 26 people and injuring 16 others as it sent dozens of vehicles tumbling into a heap of concrete and twisted steel.

Qld govt distancing itself from Miller

Queensland's government is distancing itself from embattled Police Minister Jo-Ann Miller amid relentless opposition calls for her to be sacked.

Acting Premier Jackie Trad won't say if she has confidence in the police minister, who government MPs referred to the Ethics Committee for allegedly misleading parliament.

Ms Trad was asked at least seven times if she supported Ms Miller on Wednesday, but could only say Ms Miller was working hard preparing for budget estimates hearings.

"This, quite frankly, is not going to be a circus where everybody standing up is going to comment on whether or not they have confidence in the police minister," she said.

"The police minister is entitled to have her matter deliberated on by the Ethics Committee in a way that is free from interference."

Her comments follow similar statements from Premier Annastacia Palaszczuk, who controversially took leave on Tuesday after failing to declare her support for the minister.

Ms Miller is under pressure over allegations she mishandled confidential documents, with the government accusing her of signing an incorrect statement saying she had destroyed confidential documents when she hadn't.

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Her referral to the Ethics Committee hasn't stopped the Liberal National Party calling for her axing and also asking about the police minister in this week's budget estimates hearings, despite being overruled by Labor committee chairs.

Ms Trad attempted on Wednesday to divert attention to $100,000 in donations declared by the LNP that had no names or addresses listed.